Four leg chair base



FIG. 1 is a front isometric view of a four leg chair base;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines shown in the drawing views are included for purposes of illustrating environment and form no part of the claimed design. 

CLAIM The ornamental design for a four leg chair base, as shown and described. 